What is the difference between cancel management & conservation undo?

Hi all

Undo_management = auto - means he will
UNDO_RETENTION = 900 - that's what to do?

Mahesh M says:
Hello

Thanks for your information. If the copy of the image before time given is over, I want to say undo_retention exceeds what will happen?
If the data will be deleted or what. ? Alternatively, the uncommitted data stored so permanently in storage space?

Your statement doesn't really make sense. You must understand the reason for Oracle to introduce the Undo_Retention parameter - to remove (or try) 1555 error. This setting will not enter into action if your transaction is always an active transaction because this, no matter what, Oracle to keep the space allocated to store its intact cancellation and it won't be given to anyone else at all. But this does not mean that there will be a permanent while there in the Undo tablespace. This space, which is reserved for your Undo data will be kept as long as the transaction is alive. Once more, that all space is marked as outdated and can be used by another transaction. That's where conservation undo comes into play that he would keep the Undo data for your transaction inactive (read it as committed ) for the time period indicated. But even this setting brings no guarantee that space will be not deleted. If there is a pressure of space, even the retention is defined, the undo data would be deleted.

Aman...

HTH
Aman...

Tags: Database

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